FTB-C000737 / Evidence concept

External ledger anchor

An external ledger anchor is a commitment binding retained or witnessed outside the ledger's ordinary mutable storage boundary.

Also known asexternal anchor

Advanced 2 linked topicsEvidence-reviewed

Definitions

In plain terms

It gives a later verifier an independent reference only to the extent that the witness or retention arrangement is actually trusted.

Technical

D30 A07 checks a synthetic receipt and exact anchor-envelope bytes for consistency. Witness signatures, provider authentication and independent live retention are not verified by that model.

Scope

Trust, freshness, witness independence and the exact committed bytes must be assessed separately.

Examples

  • A synthetic witness receipt binds the checkpoint digest; a different checkpoint cannot reuse that receipt.

Common misconceptions

  • Calling a local JSON receipt an anchor does not create independent real-world assurance.

Concept relationships

Prerequisites

Related

Where this concept is used

Evidence and governance

  1. RFC 3161: Time-Stamp Protocol, updated by RFC 5816 IETF · official standard

    Supports: preferred label, short definition, variant distinction

    Limits: The D30 local witness model is not an RFC 3161 service or a claim of independent external timing/retention.

  2. Locking objects with Object Lock Amazon Web Services · official platform documentation

    Supports: preferred label, short definition, variant distinction

    Limits: Retention modes and permissions differ; protection does not prevent new versions or prove payload truth.

  3. D30 glossary teaching-profile scope, Batch 013 The Fintech Builder · internal governed contract

    Supports: technical definition

    Limits: No independent regulatory mandate, real-bank dataset, service execution, external witness or production assurance is claimed.

Reviewed by
fintech-builder-batch-013
Last reviewed
2026-10-27
Next review
2027-10-27
Record status
evidence reviewed

This record is evidence-reviewed and readable, but not yet promoted to published — it is served noindex,follow and excluded from the sitemap.

Written by

Fintech engineer building market-data and financial systems, and the author of every article, glossary record, and reference implementation on The Fintech Builder.